Shaping the Energy Efficiency in New Buildings - Building Energy ...

Water conservation Canada has mandatory provisions on water conservation forcommercial buildings (MNECB 1997) and non-mandatory provisions for residentialhouses (MNECH 1997).3.6 LightingKey Findings Most APP countries cover lighting in their commercial building energy codes, butnone cover it in their residential building energy codes. China covers lighting in aseparate code. Lighting energy efficiency (or lighting power density) and lighting controls arethe most commonly addressed issues. Australia has the most stringent energy efficiency requirements for lighting inoffice buildings.Lighting energy efficiency is part of the building energy codes for commercial buildingsin six APP countries. The lighting energy efficiency provisions cover lighting in interiorand exterior spaces and lighting controls. Lighting power density (in watts per squaremeter) is employed as a key indicator for the assessment of lighting energy efficiency.Australia, Canada, China, India and the United States provide maximum lighting powerdensity by building and/room function (Table 22), while Japan and South Korea do notexpress their lighting requirements as lighting power density.Table 22 Maximum Illumination Power Density in Offices (W/m 2 )Maximum Illumination Power Density in OfficesAUS 7 (artificially lit to an ambient level of less than 200 lx 45 ) and 10 (artificially lit to anambient level of 200 lx or more).CAN 18.3 (> 25000 m 2 ) to 20.4 (0 to 200 m 2 ).CHN 11 (current value 46 ) and 9 (target value 47 ) for general offices and meeting rooms, and18 (high-class offices, design offices).IND 10.8 (building area method) and 11.8 (space function method).JAP Japan gives lighting efficiency in lumens per watt, not watts per m 2 . The commercialcode also has requirements that factor in the lit area and the distance between the lightsource and the work space. Efficient task lighting receives high scores in thisweighted system.KOR The BDCES has mandatory efficiency standards for each lighting fixture orlamp, but does not regulate the power density of the building as a whole. Thereare also requirements for controls, such as motion-sensors and the controls toallow occupants to turn off the lights in a specific part of a room. Extra pointsare given to buildings with a high share of LED lights.USA 10.8 (building area method) and 11.8 (space function method).45 lx is an international standard unit for luminance.46 The current values refer to the values required or recommended by the lighting standard.47 The target values are the values to be in use in accordance with the decisions made by relatedadministrative agencies.52